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There is a compelling usecase for tasks being able to notify runqueue that their "unihash" has changed. When this is recieved, the hashes of all subsequent tasks should be recomputed and their new hashes checked against existing setscene validity. Any newly available setscene tasks should then be executed. Making this work effectively needs several pieces. An event is added which the cooker listen for. If a new hash becomes available it can send an event to notify of this. When such an event is seen, hash recomputations are made. A setscene task can't be run until all the tasks it "covers" are stopped. The notion of "holdoff" tasks is therefore added, these are removed from the buildable list with the assumption that some setscene task will run and cover them. The workers need to be notified when taskhashes change to update their own internal siggen data stores. A new worker command is added to do this which will affect all newly spawned worker processes from that worker. An example workflow which tests this code is: Configuration: BB_SIGNATURE_HANDLER = "OEEquivHash" SSTATE_HASHEQUIV_SERVER = "http://localhost:8686" $ bitbake-hashserv & $ bitbake automake-native $ bitbake autoconf-native automake-native -c clean $ bitbake m4-native -c install -f $ bitbake automake-native with the test being whether automake-native is installed from sstate. (Bitbake rev: 1f630fdf0260db08541d3ca9f25f852931c19905) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Bitbake
BitBake is a generic task execution engine that allows shell and Python tasks to be run efficiently and in parallel while working within complex inter-task dependency constraints. One of BitBake's main users, OpenEmbedded, takes this core and builds embedded Linux software stacks using a task-oriented approach.
For information about Bitbake, see the OpenEmbedded website: http://www.openembedded.org/
Bitbake plain documentation can be found under the doc directory or its integrated html version at the Yocto Project website: http://yoctoproject.org/documentation
Contributing
Please refer to http://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded for guidelines on how to submit patches, just note that the latter documentation is intended for OpenEmbedded (and its core) not bitbake patches (bitbake-devel@lists.openembedded.org) but in general main guidelines apply. Once the commit(s) have been created, the way to send the patch is through git-send-email. For example, to send the last commit (HEAD) on current branch, type:
git send-email -M -1 --to bitbake-devel@lists.openembedded.org
Mailing list:
http://lists.openembedded.org/mailman/listinfo/bitbake-devel
Source code:
http://git.openembedded.org/bitbake/